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            <h1 style="display: none">使用Vuex实现组件传值</h1>
            
            
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                <h1 id="使用-Vuex-实现组件传值"><a href="#使用-Vuex-实现组件传值" class="headerlink" title="使用 Vuex 实现组件传值"></a>使用 Vuex 实现组件传值</h1><h3 id="1、获取仓库数据，在页面上显示"><a href="#1、获取仓库数据，在页面上显示" class="headerlink" title="1、获取仓库数据，在页面上显示"></a>1、获取仓库数据，在页面上显示</h3><h4 id="1-1-在-store-文件夹-index-js-中创建数据"><a href="#1-1-在-store-文件夹-index-js-中创建数据" class="headerlink" title="1.1 在 store 文件夹 index.js 中创建数据"></a>1.1 在 store 文件夹 index.js 中创建数据</h4><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><code class="hljs js"><span class="hljs-keyword">import</span> <span class="hljs-title class_">Vue</span> <span class="hljs-keyword">from</span> <span class="hljs-string">&#x27;vue&#x27;</span><br><span class="hljs-keyword">import</span> <span class="hljs-title class_">Vuex</span> <span class="hljs-keyword">from</span> <span class="hljs-string">&#x27;vuex&#x27;</span><br><br><span class="hljs-title class_">Vue</span>.<span class="hljs-title function_">use</span>(<span class="hljs-title class_">Vuex</span>)<br><br><span class="hljs-keyword">export</span> <span class="hljs-keyword">default</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">Vuex</span>.<span class="hljs-title class_">Store</span>(&#123;<br>  <span class="hljs-attr">state</span>: &#123;<br>    <span class="hljs-attr">name</span>: <span class="hljs-string">&#x27;dayu&#x27;</span>,<br>  &#125;,<br>  <span class="hljs-attr">mutations</span>: &#123;&#125;,<br>  <span class="hljs-attr">actions</span>: &#123;&#125;,<br>  <span class="hljs-attr">modules</span>: &#123;&#125;,<br>&#125;)<br></code></pre></td></tr></table></figure>

<h4 id="1-2-在页面中调用-state-中的数据"><a href="#1-2-在页面中调用-state-中的数据" class="headerlink" title="1.2 在页面中调用 state 中的数据"></a>1.2 在页面中调用 state 中的数据</h4><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><code class="hljs vue">&lt;template&gt;<br>  &lt;div class=&quot;home&quot;&gt;<br>    &lt;h1&gt;&#123;&#123; name &#125;&#125;&lt;/h1&gt;<br>  &lt;/div&gt;<br>&lt;/template&gt;<br>&lt;script&gt;<br>import &#123; mapState &#125; from &#x27;vuex&#x27; //引用方法 在页面组件export default的内容之前引入vuex提供的专门获取vuex中state中所有变量函数mapState<br>export default &#123;<br>  computed: &#123;<br>    ...mapState([&#x27;name&#x27;]), //<br>  &#125;,<br>&#125;<br>&lt;/script&gt;<br></code></pre></td></tr></table></figure>

<p><strong>或者在页面中直接通过$store.state.name 获取到仓库中的数据，最底层的方法适合少量的数据</strong></p>
<h3 id="2-在-vuex-中-Mutations-中定义专门修改-State-中变量的修改函数"><a href="#2-在-vuex-中-Mutations-中定义专门修改-State-中变量的修改函数" class="headerlink" title="2.在 vuex 中 Mutations 中定义专门修改 State 中变量的修改函数"></a>2.在 vuex 中 Mutations 中定义专门修改 State 中变量的修改函数</h3><p><strong>在组件 expore default{}之前引入 Vuex 提供的专门提取 Vuex 中所有 State 变量和 Mutations 方法的函数：mapState 和 mapMutations</strong></p>
<h4 id="2-1-在子页面中获取数据"><a href="#2-1-在子页面中获取数据" class="headerlink" title="2.1 在子页面中获取数据"></a>2.1 在子页面中获取数据</h4><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><code class="hljs vue">&lt;template&gt;<br>  &lt;div class=&quot;about&quot;&gt;<br>    &lt;h1&gt;请输入一个数据&lt;/h1&gt;<br>    &lt;input type=&quot;text&quot; v-model=&quot;name&quot; /&gt;<br>    &lt;button @click=&quot;dian&quot;&gt;点击传值&lt;/button<br>    &gt;//点击按钮将input中的值传给另外一个页面<br>  &lt;/div&gt;<br>&lt;/template&gt;<br>&lt;script&gt;<br>import &#123; mapMutations &#125; from &#x27;vuex&#x27; //引入方法<br>export default &#123;<br>  methods: &#123;<br>    ...mapMutations([&#x27;setname&#x27;]), //将修改的数据通过自定义名setname传入仓库<br>    dian() &#123;<br>      this.setname(this.name)<br>    &#125;,<br>  &#125;,<br>  data() &#123;<br>    return &#123;<br>      name: &#x27;&#x27;,<br>    &#125;<br>  &#125;,<br>&#125;<br>&lt;/script&gt;<br></code></pre></td></tr></table></figure>

<p><strong>修改数据也可以直接通过 this.$store.commit(‘setname’,this.name)进行修改，也是底层方法</strong></p>
<h4 id="2-2-在-store-中-index-页面代码"><a href="#2-2-在-store-中-index-页面代码" class="headerlink" title="2.2 在 store 中 index 页面代码"></a>2.2 在 store 中 index 页面代码</h4><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><code class="hljs js"><span class="hljs-keyword">import</span> <span class="hljs-title class_">Vue</span> <span class="hljs-keyword">from</span> <span class="hljs-string">&#x27;vue&#x27;</span><br><span class="hljs-keyword">import</span> <span class="hljs-title class_">Vuex</span> <span class="hljs-keyword">from</span> <span class="hljs-string">&#x27;vuex&#x27;</span><br><br><span class="hljs-title class_">Vue</span>.<span class="hljs-title function_">use</span>(<span class="hljs-title class_">Vuex</span>)<br><br><span class="hljs-keyword">export</span> <span class="hljs-keyword">default</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">Vuex</span>.<span class="hljs-title class_">Store</span>(&#123;<br>  <span class="hljs-attr">state</span>: &#123;<br>    <span class="hljs-attr">name</span>: <span class="hljs-string">&#x27;&#x27;</span>,<br>  &#125;,<br>  <span class="hljs-attr">mutations</span>: &#123;<br>    <span class="hljs-title function_">setname</span>(<span class="hljs-params">state, name</span>) &#123;<br>      <span class="hljs-comment">//这里的name是形参，可以自定义 表示传入的值</span><br>      state.<span class="hljs-property">name</span> = name<br>    &#125;, <span class="hljs-comment">//将传输得到的name值赋值到state中的name</span><br>  &#125;,<br>  <span class="hljs-attr">actions</span>: &#123;&#125;,<br>  <span class="hljs-attr">modules</span>: &#123;&#125;,<br>&#125;)<br></code></pre></td></tr></table></figure>

<h4 id="2-3-在主页面中显示获取到的数据"><a href="#2-3-在主页面中显示获取到的数据" class="headerlink" title="2.3 在主页面中显示获取到的数据"></a>2.3 在主页面中显示获取到的数据</h4><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><code class="hljs vue">&lt;template&gt;<br>  &lt;div class=&quot;home&quot;&gt;<br>    &lt;h1&gt;&#123;&#123; name &#125;&#125;&lt;/h1&gt;<br>  &lt;/div&gt;<br>&lt;/template&gt;<br>&lt;script&gt;<br>import &#123; mapState &#125; from &#x27;vuex&#x27; //引入上述得到仓库数据的方法<br>export default &#123;<br>  computed: &#123;<br>    ...mapState([&#x27;name&#x27;]), //得到仓库state中name的值<br>  &#125;,<br>&#125;<br>&lt;/script&gt;<br></code></pre></td></tr></table></figure>

                
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